[issue40275] test.support has way too many imports

[hai shi]

hai shi <shihai1991 at 126.com> added the comment:

Hi, victor:
  About https://bugs.python.org/issue40275#msg369214, shall we continue to improve the libregretest?
1. Running test cases sequential: you have use a mechanism to unload the modules which load in the running test cases stage: https://github.com/python/cpython/blob/master/Lib/test/libregrtest/main.py#L437
2. Running test cases concurrently: It have use subprocess to isolate the module resources, no?
I am not sure about it.

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